Wondering if you bought the car? I have the 2014 A6 C7 Allroad 245hp. Currently on 185,000miles. It’s the best car I’ve owned. Service it regularly, including transmission at 60k, using the recommended oil and you shouldn’t have any problems. I’ve had very few issues with mine apart from the usual wear and tear items like wheel bearings, CV joints. Replaced both rear airbags, £150 ea on eBay, no major issues. I bought mine 3yrs ago with full Audi service history and have it serviced every +/- 5000 miles. Passes MOT each year with no issues. I would definitely buy a newer one however it’s hard for me to justify as only use it 6 months per year.